I'm speechless. such a great game. the atmosphere is just right and the puzzles are pretty well. it took me some time to figure out the effect of switching on/off the lights, but finally i got it. But just a bit later the puzzle with the sheets of paper gave me the rest. unfortunately it looks like you didn't made a walkthrough jet. could you pls PM me some additional hints ?
oh, one last thing: you definitively need to add a volume control.